Just to clarify...
Cam - someone goes into the cinema with a camcorder + posts it on the net. ewww.
Telesync - Usually an 'after hours' setup, with a properly tripodded camera and decent direct audio linkup. Can range from medium to near DVD (if done right)
Screener - A pre-release rip (see below). Generally has copyright notices and may not (rarely) be the final edit. DVD Quality.
Rip - Digitally grabbed from a release DVD and (generally) re-encoded with mpeg4.
You generally can tell a cam from a telesync as the perspective is usually screwed in the cam as you really need the cam at the same place as the projector. The colours are generally washed out + oversaturated in the above, DVD is the only real way of getting it as it should be.
btw vcd = mpeg1, svcd = mpeg2, dvd = mpeg2, divx/xvid = mpeg 4.
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